Signal apparatus.



inviti?En -sTai`Es no. esami;-

Specification of Lettersjatent.

Pateatednec'. 11, 1906.

Application nei Apfii 5, i906. seria rimanesse.

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supports the spring Vd and which serves at the sain-e time an` object on which toattach contact for low temperature. ,.tlierheat or cold decreases after having actu- )Be it known that l, HERMANN SANnvo'ss, a subject of Ithe German Emperor, residing at Neussfon-the-Rhine, Germany', have invented new and useful Improvements in Signal ilpparatus, of which the followingis a specineat/ion.

This invention relates to a signal apparatus more particularly designed for operating an alarm when the temperature oi a room rises above or falls below the degree desired. The apparatus may also be applied `to 'parts of a machine in order to indicate when the same assume an excessive high temperature.

lin the-accompanying drawings, Figure l is a longitudinal section through my improved. signa-l apparatus. Fig. 2 shows the sanie applied to a pitnianhead of an engine: Fig. 3 is. a 'side view` famodiication of the ysigiial apparatus 5 Fig. l tion thereof; and Fig. 5 a plan oi" Fig'. a.

The apparatus, which is inlluenced by the temperature, consists of a tubular casing a, containing a rod or plunger b. 'It is' advisable to furnish this rod with a collar e, which the elastic mantle or pipe e, which prevents the liquid from coming into contact with the rod as it covers the .rod justas far as the latter engages into the casing a. For this reason the pipe or hose is preferably attached to the screwf, which closes casing a. I

Wrhen the liquid is expanded by the heat, the rod is moved outwardly, while 'when the temperature falls the spring d or other suitable means Vforces the rod bach, whereby the4 alarm is actuated both forward. and backward.

Y lf in the example taken in Fig. l the rod b is actuated by the uheat, it'touches the screw t, forming one oi the contacts, and rings the alarm, the housing uf of the rod being under current. li the heat diminishes, 'the rod, in-

luenced by a spring d, a weight, or similar means, is driven back until the collar v on the rod engages the contact zr, which is brought through the housing, so that an alarm is rung. This contact, also, may be adjustable. The above-described apparatus needs only oneA centactfor high temperature and a second li', therefore,

ated alarm, the rod returns from the con- Uate'diin any other in a1mer--as, for-example, releasing mechanical contrivance, etc.

, a front view, partly in secwith a collar m, having a substantia ts and stops the alarm, which niay be ac- In the mode .of construction shown in Fig. 2', lwhere the alarm' is on a connecting-rod bearing, the rod when forced outward out of thezhousing a by the'tempierature strikes against the lever g, which is by a weight'h coming beyon the point of balance. The lever Jfalls as soon as the weight passes the center, land the contact-screw i fr'alls against the contact-spring c, closing the current, which must subsequently be switched off by hand. By these means an alarm is operated which indicates thatthe pitinaubearing is overheated and requires.

ubrication. 4The supply o f lubricant could also be controlled by the alarm.

6e. I e t in its'place .In Figs. 3-'5 a modification of iny im roved signal apparatus `is shown, in which t, e cur-y rent operating the alarm is automatically broken after the heat has been reduced,

The-free end of rod or plunger b is provided ly triangularheadn, 5.- Opposite plunger b there is pivoted at y a three-armlever p so. Arm v of this lever. engages a irst contactspring g in such a manner that the lever when tilted will press spring'g against 'a second contact-spring r to close a circuit. Lever arm p is shorter than arm s, as shown inFig. 4. The parts are so assembled that the head n -during its travel with the pitman-liead normally clears both arms p and s. lf lunger bis advanced by Aexcessive heat,/it wi l strike f against the free end of lever p, to thereby ltilt lever p s e in the direction of the arrow, Fig. Il, and close contact g 1*. head has been 'gradually cooled, plunger b will recede to strike against arm s and return lever p s o to its Vnormal position, whereby contact g r is broken.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is-- In a signal apparatus, a tubular casing, combined with an inc-losed expansible liquid and a headed plunger, an elastic mantle surrounding the plunger and secured to the plunger-head and casing, and a contact on the plunger adapted to operate an alarm, substantially as specified.

Signed by nie at Dusseldorf, Germany, this 15th day ofMarch, 1906.

HERMANN sANnvoss.

Vhen the pitmane IOO 

